Kitos
611e10620e
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- Create domain/errors.py as canonical error hierarchy: DomainError, InvalidStateTransition, PermissionViolation, BusinessRuleViolation, EntityNotFoundError, DuplicateEntityError - InvalidOperationError now inherits from BusinessRuleViolation for semantic consistency - Convert domain/exceptions.py to backward-compatible re-export shim with legacy aliases (DomainException, InvalidTransitionError, AuthorizationError) - Update error_handler.py to import from domain/errors.py and map all new error types - Update main.py to register DomainError (new base) as the exception handler root
97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
"""Canonical domain error hierarchy for Aegis.
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Every service-layer error should be a subclass of :class:`DomainError`.
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The global exception handler in ``app.middleware.error_handler`` maps
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each concrete subclass to an appropriate HTTP status code so that
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services never depend on FastAPI.
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Existing code that imports from ``app.domain.exceptions`` continues to
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work — that module re-exports everything defined here.
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"""
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from __future__ import annotations
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class DomainError(Exception):
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"""Base for all domain errors."""
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def __init__(self, message: str, *, code: str = "DOMAIN_ERROR") -> None:
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self.message = message
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self.code = code
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super().__init__(message)
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# ── Entity lifecycle ──────────────────────────────────────────────────
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class EntityNotFoundError(DomainError):
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"""A requested entity does not exist."""
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def __init__(self, entity: str, identifier: str) -> None:
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super().__init__(f"{entity} not found: {identifier}", code="NOT_FOUND")
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self.entity = entity
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self.identifier = identifier
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class DuplicateEntityError(DomainError):
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"""Creating an entity that already exists."""
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def __init__(self, entity: str, field: str, value: str) -> None:
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super().__init__(
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f"{entity} with {field}='{value}' already exists",
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code="DUPLICATE",
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)
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# ── State machine ────────────────────────────────────────────────────
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class InvalidStateTransition(DomainError):
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"""A state-machine transition is not allowed."""
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def __init__(
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self,
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current_state: str,
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target_state: str,
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valid_transitions: list[str] | None = None,
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) -> None:
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msg = f"Cannot transition from '{current_state}' to '{target_state}'"
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if valid_transitions:
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msg += f". Valid transitions: {valid_transitions}"
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super().__init__(msg, code="INVALID_TRANSITION")
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self.current_state = current_state
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self.target_state = target_state
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self.valid_transitions = valid_transitions or []
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# ── Business rules ────────────────────────────────────────────────────
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class BusinessRuleViolation(DomainError):
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"""An operation violates a business invariant."""
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def __init__(self, message: str) -> None:
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super().__init__(message, code="BUSINESS_RULE_VIOLATION")
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class InvalidOperationError(BusinessRuleViolation):
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"""An operation is invalid in the current context.
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Kept for backward compatibility; new code should prefer
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:class:`BusinessRuleViolation` directly.
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"""
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def __init__(self, message: str) -> None:
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super().__init__(message)
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self.code = "INVALID_OPERATION"
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# ── Authorization ────────────────────────────────────────────────────
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class PermissionViolation(DomainError):
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"""The user lacks permissions for an action."""
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def __init__(self, message: str = "Insufficient permissions") -> None:
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super().__init__(message, code="FORBIDDEN")
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